Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended	9 Months Ended
	Mar. 31, 2012 Series D Convertible Preferred Stock	Dec. 31, 2012 Series E Convertible Preferred Stock
Issuance of convertible preferred stock for cash, issuance costs	$ 96	$ (153)